Physical and Chemical Changes

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What is a physical change?

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A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in state (like melting or freezing) and changes in shape or size.

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What is a chemical change?

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A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and changes the chemical composition of the substance. Examples include rusting, burning, and photosynthesis.

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Is burning wood a physical or chemical change?

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Burning wood is a chemical change because it produces new substances (ash, smoke, gases) and involves a chemical reaction.

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What happens to the chemical composition during a physical change?

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During a physical change, the chemical composition of the substance remains the same; only its physical properties change.

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What is an example of a chemical property?

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An example of a chemical property is the ability of a substance to react with another substance, such as water reacting with sodium.

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What is photosynthesis?

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Photosynthesis is a chemical change where plants convert carbon dioxide and water into glucose and oxygen using sunlight.

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What is the difference between a physical change and a chemical change?

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A physical change alters physical properties without changing the substance's chemical composition, while a chemical change results in the formation of new substances.

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What is an example of a physical change?

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An example of a physical change is ice melting into water.

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What is the significance of chemical changes in everyday life?

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Chemical changes are significant because they are involved in processes like digestion, combustion, and the production of energy.

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What is an example of a chemical change in cooking?

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An example of a chemical change in cooking is baking a cake, where ingredients undergo chemical reactions to form new substances.